class ExceptionLoggingSubscriberTest

class ExceptionLoggingSubscriberTest extends KernelTestBase {
    
    /**
     * The service name for a logger implementation that collects anything logged.
     *
     * @var string
     */
    protected $testLogServiceName = 'exception_logging_subscriber_test.logger';
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'test_page_test',
    ];
    
    /**
     * Tests \Drupal\Core\EventSubscriber\ExceptionLoggingSubscriber::onException().
     */
    public function testExceptionLogging() : void {
        $http_kernel = \Drupal::service('http_kernel');
        $channel_map = [
            400 => 'client error',
            401 => 'client error',
            403 => 'access denied',
            404 => 'page not found',
            405 => 'client error',
            408 => 'client error',
            // Do not check the 500 status code here because it would be caught by
            // Drupal\Core\EventSubscriberExceptionTestSiteSubscriber which has lower
            // priority.
501 => 'php',
            502 => 'php',
            503 => 'php',
        ];
        $level_map = [
            400 => RfcLogLevel::WARNING,
            401 => RfcLogLevel::WARNING,
            403 => RfcLogLevel::WARNING,
            404 => RfcLogLevel::WARNING,
            405 => RfcLogLevel::WARNING,
            408 => RfcLogLevel::WARNING,
            501 => RfcLogLevel::ERROR,
            502 => RfcLogLevel::ERROR,
            503 => RfcLogLevel::ERROR,
        ];
        // Ensure that noting is logged.
        $this->assertEmpty($this->container
            ->get($this->testLogServiceName)
            ->cleanLogs());
        // Temporarily disable error log as the ExceptionLoggingSubscriber logs 5xx
        // HTTP errors using error_log().
        $error_log = ini_set('error_log', '/dev/null');
        foreach ($channel_map as $code => $channel) {
            $request = Request::create('/test-http-response-exception/' . $code);
            $http_kernel->handle($request);
        }
        ini_set('error_log', $error_log);
        $expected_channels = array_values($channel_map);
        $expected_levels = array_values($level_map);
        $logs = $this->container
            ->get($this->testLogServiceName)
            ->cleanLogs();
        foreach ($expected_channels as $key => $expected_channel) {
            $this->assertEquals($expected_channel, $logs[$key][2]['channel']);
            $this->assertEquals($expected_levels[$key], $logs[$key][0]);
            // Verify that @backtrace_string is removed from client error.
            if ($logs[$key][2]['channel'] === 'client error') {
                $this->assertArrayNotHasKey('@backtrace_string', $logs[$key][2]);
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function register(ContainerBuilder $container) {
        parent::register($container);
        $container->register($this->testLogServiceName, BufferingLogger::class)
            ->addTag('logger');
    }

}